i cannot give a definitve answer to that.
there is/was a cod decompiler, but i don't know anybody who used it successfully to decompile a complex program.
i gave it some hours try and never succeeded.
even if you would be able to decompile a program you would be a good step away from stealing any of it, but if you are concerned you can use additional obfuscation layers or whatever.
personally i doubt that anybody would gain something by using the decompilation approach, and my experience shows that whatever decompiler exists is not working properly.
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